Virusloids

Virusloids (or Virus Vocaloids) is a series of fanloids based on images of the original vocaloids that have been infected by a computer virus, and for this reason have begun to behave themselfs negatively and strangely, started to preying on their originals. Most often their appearance is an inversion of the colors of the originals and one (or both) of their eyes is the opposite color of the other eye (reversed color iris and black whites)

History
It all started when a user named Asai created a post on piapro in which they presented their variation on Hatsune Miku with words: "I wonder what it would be like to have a virus inside Miku with a personality of its own." This version was later called Miku Virus and started this series. Later, one of Asai's acquaintances, Oniyama Mizuki, became interested in Miku Virus and was inspired by them to create Rin Virus (nothing is known about the existence of Len Virus). Soon another user under the nickname Sekizan decides to create Luka Virus. The most popular character in the series to this day is Miku Virus, because there's not much attention has been devoted to the other Virusoids, but the series itself is considered to be relatively forgotten